create table "aaa1"
("oid" varchar2(50) not null,
"name" varchar2(50),
"pid" varchar2(50),
"sort" int,
"version" char(10),
primary key("oid", "version")
);commit;
delete from aaa1;
insert into "aaa1" ("oid","name","pid","sort","version") values ('0', '事項', '-1', 1, '2018-01-01');
insert into "aaa1" ("oid","name","pid","sort","version") values ('1', '事項1', '0', 1, '2018-01-01');
insert into "aaa1" ("oid","name","pid","sort","version") values ('2', '事項2', '0', 2, '2018-01-01');
insert into "aaa1" ("oid","name","pid","sort","version") values ('11', '事項11', '1', 1, '2018-01-01');
insert into "aaa1" ("oid","name","pid","sort","version") values ('12', '事項12', '1', 2, '2018-01-01');
insert into "aaa1" ("oid","name","pid","sort","version") values ('21', '事項21', '2', 1, '2018-01-01');
insert into "aaa1" ("oid","name","pid","sort","version") values ('211', '事項211', '21', 1, '2018-01-01');
insert into "aaa1" ("oid","name","pid","sort","version") values ('212', '事項212', '21', 2, '2018-01-01');
insert into "aaa1" ("oid","name","pid","sort","version") values ('0', '事項', '-1', 1, '2018-03-01');
insert into "aaa1" ("oid","name","pid","sort","version") values ('1', '事項1', '0', 1, '2018-03-01');
insert into "aaa1" ("oid","name","pid","sort","version") values ('2', '事項2', '0', 2, '2018-03-01');
insert into "aaa1" ("oid","name","pid","sort","version") values ('11', '事項11', '1', 1, '2018-03-01');
insert into "aaa1" ("oid","name","pid","sort","version") values ('12', '事項12', '1', 2, '2018-03-01');
insert into "aaa1" ("oid","name","pid","sort","version") values ('21', '事項21', '2', 1, '2018-03-01');
insert into "aaa1" ("oid","name","pid","sort","version") values ('211', '事項211', '21', 1, '2018-03-01');
insert into "aaa1" ("oid","name","pid","sort","version") values ('212', '事項212', '21', 2, '2018-03-01');
commit;
--sql1
select "oid","name","pid","sort","version"
from "aaa1"
where version = '2018-03-01'
connect by prior oid = pid and version = '2018-03-01'
start with oid = '0' and version = '2018-03-01'
order siblings by sort;
--sql2
select "oid","name","pid","sort","version"
from "aaa1"
--where version = '2018-03-01'
connect by prior oid = pid and version = '2018-03-01'
start with oid = '0' and version = '2018-03-01'
order siblings by sort;
--sql3
select "oid","name","pid","sort","version"
from "aaa1"
where version = '2018-03-01'
connect by prior oid = pid --and version = '2018-03-01'
start with oid = '0' --and version = '2018-03-01'
order siblings by sort;
--sql4
select "oid","name","pid","sort","version"
from "aaa1"
where version = '2018-03-01'
connect by prior oid = pid --and version = '2018-03-01'
start with oid = '0' and version = '2018-03-01'
order siblings by sort;
請注意，在層級表中若存在多個版本的話，只查詢某個版本資訊的情況時，若僅僅在where中書寫where會把其他version的也查詢出來，connect by和start with也需要限定查詢條件，只有sql1是正確的查詢方式
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